Computing-machine



A. D. HARMON. COMPUTING MACHINE.

APPLICATION FILED FEB. l0. l9l9.

2 SHEETS-SHEET l.

222:: in s ,r |\.\\|l\l\|l llfi e Patented Aug. 24, 1920.

A. D. HARMON.

COMPUTING MACHINE.

APPLICATION FILED FEB. Io, I9I9.

Patented Aug. 24, 1920.

2 SHEETS-SHEET 2.

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IU Iv nu 987654521Ovc 2--2 in Fig. 1

UNITEDSTATES PATENT OFFICE.

ALTON D. HARMON, OF ERIE, PENNSYLVANIA, ASSIGNOR 0F ONE-THIRD T0 JOHN S. OWEN AND ONE-THIRD TO ANNIE W. S. STRONG, BOTH OF ERIE, PENNSYLVANIA.

COMPUTING-MACHINE.

Application filed February 10, 1919.

olf, ifa/wia may concern l t known that I, Auron D. Hannon, .tunen ot the Uni States, residing at Ii, r

Erie, in the wunty of and State of Pennsylvania., have invented certain new and nns to make and use the saine, .reference ng had to the accompanying drawings,

f to the letters of reference marked thereon, forming part of this specification.

This invention relates to ffalr-ulating machines and consists in certain improvements in the ine-.chine tor which a patent vas issued to me on March 7, 1916, No. 1,174,315, as hereinafter Yfully described, and claimed.

ln the drawings- Figure 1 .is a liront view o a calculating machine constructed according to the present invention.

Fig. Q is a longitudinal section on the line Fi 3 is a like view on the line 3-3 in Fig. 1.

Fig. 4l a plan view of one. ot the signal slides ot my invention.

Fig. 5 is a view in elevation ot' one end of the same.

Fig. 6 is a like view of the opposite end ol the same.

Fig. 7 i, a transverse section on the line '(-7 in Fig. 1..

Fig. 8 is a fragmentary plan view of my invention with a portion of the top plate broken away, and parts of the mechanism removed.

Fig. 9 is a longitudinal section on the line 9--9 in Fig. 8.

Fig. 10 is a plan view of one oi the slides of' my invention.

Fig. 11 is a. section on the line 2-2 in Fig. 1, showing the slide drawn downwardly to the limit of its movement.

This calculating machine is preferably constructed oi? thin sheet metal, but other approved material may be used. The front or top plate A is preferably provided with a. flange ff, along one end and two sides thereof, and the lower edge ail of said flange is turned backward (see Figs. 2, 7 and 9) parallel with the plate A, for the purpose hereinafter set forth.

Specification of Letters Patent.

Patented Aug. 24. 1920.

Serial No. 276,148.

The plate A is provided with longitudinal slots A', A, A, A4, A, A" and A7, equally spaced apart so that the metal between said slots is preferably equal in width to the width oi said slots; and along one edge of each oi? sai-il slots a flange o2 is turned downwardly shown in Figs. i? and 9. The plate A also provided with sight-holes o3 substantially in line with the strips of metal between the slots A, A2, &c., Yfor the purpose hereinafter set forth.

Upon the perimetrical flanges a. oit the front plate A I place a back plate B which conta-ets with the lower edges of the depending flanges c2.

T he back plate B is provided with ratchet shaped tooth racks i') and Z1 (see Figs. 2, 3 and 8) under each otI the slots in the plate A; the rack teeth being inclined toward the upper end of the back plate B, and the rack Z/ toward the lower end oi the back plate as indicated in Fig. 8.

Upon the back plate, between each of the depending Vflanges r2 I place duplicate slides C (see Figs. 8 and 10) which slides are held in place in relation to each other by means of said depending flanges o2, as shown in Fig. 8.

Each of the slides C is provided with nine notches er holes c which coincide with the racks I) in the back plate l), and with nine holes c which coincide with the racks b in the back plate B, and are also provided at the upper ends thereof with a ratchet notch e2 as shown in Figs. 10 and 11.

Secured to the rear face of the front plate A., parallel with and adjacent t0 the depending flanges o2 are strips of spring metal b2 which press downwardly upon each of the slides C to act as a brake to prevent the slides C from being accidentally moved; and between the front plate A and said springs L2 l place signal slides D (see Figs. 4. and 8) which are immediately underneath the metal of the front plate between the slots A', A2, SLc. These signal slides are provided with a projecting portion l and d at each end thereof; the projection d extending across the slot A having a portion of the upper edge et the projection cl bent downwardly as shown in Fig. 11, so that it will. engage the ratchet notch c2 at the upper end of' the adding slide C when it is drawn downwardly to the limit of its movement, as illustrated in Fig. 11, so as to prevent the slide C from being withdrawn entirely from the machine; and the projections CZ being adapted to extend over the adjacent slot A2, as is the case with the succeeding'slides with relation to the slots A2, A3, &c.

The slides D are of such length that when the projection Z is visible at the upper end of the slots, the projection d disappears under the plate A at the lower end of the slot. Y

ln order to maintain the signal sliderD under the metal of the plate A, between the slots A, A2, c., said signal slides are provided with downwardly projecting lips (Z3, (see Figs. 5 and 6) which enter the spaces between the slides C.

'll he action of the springs b2 tends to press the signal slides D upwardly against the metal of the front plate between the slots A A2 A3, dac., thereby preventing said slides from being accidentally moved. Upon the metalof the front plate, between the slots A, A2, &c., are printed numerals from 1 to 9 inclusive, opposite each of the notches c and upon the slides C are printed numerals from 0 to 9 inclusive, in such position that they will be visible through the sight openings c3.

In operation, if it is desirable to add 9 and 9, the stylus is placed in notch c of a slide C under slot A, opposite said numeral. printed on the face plate at the left of said slot, and by means of the stylus said slide C is moved downward only until the stylus reaches the lower end of the slot A; the stylus when so inserted in said notch eX- tending therethrough and into the ratchet teeth b in the back-plate B thereunder, which permits movement of the stylus in a downward direction only. Then the stylus is inserted in the round hole c in said slide C showing at the upper end of said slot A opposite said numeral 9, said stylus projecting therethrough into the ratchet teeth b in the back-plate B thereunder, which prevents downward movement of the stylus and said slide C. The stylus is then moved upwardly carrying said slide along with it until the stylus reaches the upper end of the slot A. l/Vhile moving upwardly in the slot A the stylus engages the projection d of the signal slide D at the left of the slot A', which extends across the slot A and causes the said signal slide to move upwardly thus causing the extension d on the lower end of the vsignal slide D to show at the lower end of the neXt adjacent slot A2, and when the stylus stops by reason of its contact with the upper end of the slot A, the slide C under said slot will show the numeral 8 at the right hand sight opening a3. rlhe eX- tension fl on the signal slide D which is now showing at the lower end of the slot A2 indicates that 1 must be transferred to slide C under that slot. To accomplish this the stylus is mounted in the notch in the slide C under the slot A2 which is opposite the numeral 1 printed on the face plate at the left of said slot, and by means thereof said slide is moved downward until the stylus contacts with the lower end of the slot A2. This causes the extension d on the signal slide D to disappear at the lower end of the slot A2 and the extension Z thereon to reappear at the upper end of the slot A; also the adding slide C-under the slot A2 is caused to move downwardly until the numeral 1 appears vat the sight opening a2 over said add* ing slide, thus indicating that the sum of 9 plus 9 is 18.

The operation of the succeeding slides is identical with that above described. The ratchet shaped rack teeth vand Z9 in the back plate B are for the purpose of preventing the stylus from being moved in a wrong direction. I

lt will be noted that the construction of the signal mechanism hereinbefore described is entirely different from that shown and described in my aforesaid Letters Patent; the same being much more simple and re-4 quiring a less number of parts, and therefore being more economical :in-manufacture.

Having thus shown and described my invention so as to enable others to utilize the same, what l claim as new and desire to secure by Letters Patent is:

1. ln a calculating machine, a face plate having a slot therein, a baclrplate, an adding` slide between said face and back plates under said slot, a longitudinally movable transfer signal slide between said face plate and said adding slide, an ear on one end of said transfer signal slide extending across said slot and another at the opposite end thereof extending across the next adjacent slot in said face forth.

2. ln a calculating machine of the class described, a longitudinally movable transfer signal slide, a lateral extension at one end of said slide, an extension at the opposite side of the other end thereof, a down turned ear at each end of said signal slide, substantially as and for the purpose set forth.

3. In a calculating machine, a face plate having a slot therein, a back plate, an adding slide between said plates under said slot, a longitudinally movable transfer signal slide between said face plate and said adding slide, and means on said adding slide to engage said signal slide to limit the down-l ward movement of said adding slide, substantially as set forth. Y

ln testimony whereof l atlix my signature.

ALTCN D. HARMON.

plate, substantially as set- 

